<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>hello world</title>
    <script src="../vue.js"></script>
</head>

<body>
    <div id="app">{{content}}</div>
    <div>{{content}}</div>
    <script>
        // var app = document.getElementById('app');
        // app.innerHTML = 'hello world';
        var app = new Vue({
            el: '#app',
            data: {
                content: 'hello world!'
            }
        })
        setTimeout(function () {
            app.$data.content = 'bye world'
        }, 2000)
    </script>
</body>

</html>